Heat tratment
Heat tratment
(OP)
I am trying to heat treat 30mm dia 530M40 to achieve
ISI 898 GRADE 8.8 BOLT SPEC and need advice on heat treatment
ISI 898 GRADE 8.8 BOLT SPEC and need advice on heat treatment
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RE: Heat tratment
The spec calls out a core hardness of 23-34 HRC, minimum tempering temperature of 425C. Surface hardness shall not exceed core by more than 30 Vickers (2 HRC points).
Equipment should be such that the fasteners can be loaded in a single layer. Quench should be oil. Temper as noted.
RE: Heat tratment